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Compaq ProLiant 5000 Servers Reference Guide
Writer: Project: Network Interface Controllers Comments:
File Name: K-ch7.doc Last Saved On: 4/18/97 6:46 PM
100Base-TX networks require a slightly different implementation than
10Base-T networks because new hubs and different wiring configurations are
necessary. 100Base-TX supports a maximum of 100 meters of Unshielded
Twisted Pair (UTP) from the hub to the workstation and up to 5 meters
between hubs. 100Base-TX allows one layer of cascaded hubs, which makes
the maximum network diameter 205 meters. In some installations, switching
hubs may be needed to increase the diameter of a 100Base-TX network.
Figure 7-2. Typical 100Base-TX network
100Base-TX achieves 100-Mb/s speed by sending the signal 10 times faster
than 10Base-T. Signal integrity is retained by using two pairs of data-grade,
Category type 5 (CAT 5) cabling. Because 100Base-TX uses exactly the same
transport method as 10 Mb/s Ethernet, it supports either half- or full-duplex
operation. Full-duplex mode requires a hub and allows the network controller
to transmit and receive simultaneously, for data throughput of up to 200 Mb/s.
100Base-TX does not operate over voice-grade (CAT 3) wire. Because CAT 3
wiring has been available longer than CAT 5, wall outlets, punch down
blocks, and existing wiring configurations may not include CAT 5 accessories.
100Base-TX requires CAT 5 wall outlets and punch down blocks for proper
operation. In addition, the building must be wired to EIA/TIA 568
specifications.
